GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: alien.46.uk on 19 August 2009, 21:31
-
**Reposted this here as I think the origional place is wrong.**
Hi All,
I posted a while ago about a problem with my 8v '94 GTI. When warming, car runs fine. Temp increases to about normal and start to missfire, and cough and splutter and on the odd occasion eventually cut itself out.
So far the following has been changed:
Coolant
Water Temp Sensor
Dizzy Cap
HT Leads
Wiring has been checked as far as accessable and seems fine. The earth point is fine and solid. The is one of the three threaded bits without a connection attached, but either way the ground for the water temp sensor is on there fine.
As said, when first warming she's fine and will rev freely, when warm she'll cough, splutter, miss and sometimes eventually cut herself out.
No error codes are read and I am in total confusion.
I suspect if the timing was out, she wouldn't run fine on warm up?
I myst also add that when she coughs, splutters and runs rough, when I disconnect the Water Temp sensor, she will go back to running fine and will drive quite nicely also. Plug it back in, all will be fine for a while before going back to it's bad state.
I'm after any more help as it's winding me up now and I need to get her sold soon.
I've taken some pics of the engine bay so anyone can see if anything looks majorly wrong from the pics:
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00605.jpg)
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00605.jpg)
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00608.jpg)
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00609.jpg)
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00610.jpg)
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00611.jpg)
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00612.jpg)
(http://i14.photobucket.com/albums/a317/taazzukcb/DSC00613.jpg)
Large scale images available.
After a Wiring diagram for this model and year to if possible incase its something wrong there.
Many Thanks.
-
Hi there,
Interesting... I'm just wondering and this is a bit of a curve ball but how long has that induction filter been there? It looks mighty close to the engine in your pics and from what i can see looks quite dirty... It could be as the engine heats up she's sucking up the heat from the engine and that's causing you problems. I can see you have some sort of cold feed there but even so.
Just a thought.
Andy
-
Thanks for the reply.
No idea on the time the pods been on. I've only had her 3 weeks as a p/x on a bike. Was just to tinker and fix up and sell on as I normally do with bikes.
The filter isn't in the best of conditions and I suspect has a fair few miles under its belt. I will give it a clean, but in all honesty, I dont know if it will help. It was similar under driving conditions but then a dirty air filter and a cold air feed that looks to be done by a 3 year old can't help in any case, so it's worth doing anyway.
-
Im thinking that funky wiring on the MAF might be up to something.
-
Im thinking that funky wiring on the MAF might be up to something.
+1 also what is the unit on the inner arch, never seen one before.
-
Oddly enough, there's no reason for all that blue tape. There's no modified wiring there at least anyway. His interior wiring was a little bit "interesting" but that was soon rectified and everything now functions 100%. However the engine continues with this problem. I will investigate this wiring further incase something was missed.
Does the 2E run an Inlet Manifold Temp Sensor before the MAF as I've seen in some later 8v GTi's ?
If so, mine is not there any may account for the extra unused earthing point ... ?
Thanks in advance once again.
-
Im thinking that funky wiring on the MAF might be up to something.
+1 also what is the unit on the inner arch, never seen one before.
Tbh I've never really paid much attention to that. I will take a good look and take some more pics.
Any 2E 8v Wiring diagrams about?
Thanks.
-
Aint that the carbon cansiter?
-
Aint that the carbon cansiter?
Don't think so.
The maf / wiring / air filter all looks bodged to me.
-
I agree wayne. Would take the wiring back to where it joins, and replace it.
-
Unplug it and see if it helps
-
I also think it would run a lot better on a standard air box, all that cone is doing that close to the engine is sucking in heat.
-
It sucks alright.
-
I totally agree with the pod being useless, they rarely increase any sort of BHP with the exception of possibly covered pods with a sealed cold air intake.
Cant however imagine an Air box to be cheap and with this only a p/x fix up and sell on it's eating time and profits, but if it'll cure this issues it's worth it.
So should the 2E have an intake temp sensor before the MAF?
GTiAdam, unplug what, the MAF?
Many Thanks.
-
GTiAdam, unplug what, the MAF?
Yep
-
Yeah the intake temp sensor SHOULD be in the cone itself.
-
GTiAdam, unplug what, the MAF?
Yep
Ok will give it a try.
Will run her to temp untill she starts spluttering and will disconnect it.
As stated origionally, when running in this bad state, disconnect the water temp sensor and she'll start to run fine once again, even with a new temp sensor, but will see if the MAF makes a difference.
-
Yeah the intake temp sensor SHOULD be in the cone itself.
Right ... This may be where the story unfolds. I dont think there is one as I havent found any trailing wires unless the previous owner inserted them further back in the intake (The Mk3 Issues page shows the temp sensor wiring is external, so assume they will/should have been inserted somewhere down the line to put the sensor in the pod?).
Perhaps they were simply cut off?
However, should this have thrown an error code up? If so, I am not getting any.
-
if you're lucky, the old owner may still have the stock airbox? :smug:
Just a thought :smiley:
Failing that, take the existing cone filter off, get an old toothbrush and clean it as best as you can, if possible, get some filter cleaner and let it rip :grin:
-
where is the water temp sensor just out of interest?
-
It's in the water pipe feed and return valve just in front of the head.
Also found there is no Air intake temp sensor. There is a 2-wire plug with no where to go, can anyone confirm the cable colours for the intake sensor please?
Now to source a 2E air box and sensor (assumably a different shape to AGG?).
This is assuming this can cause the problem and removing the water temp cable puts it into set-up mode anyway where it'll use some default settings? Hence it running fine when disconnected?
Water Sensor:
(http://i14.photobucket.com/albums/a317/taazzukcb/weater.jpg)
-
airboxes are all the same :wink: and if your engine runs fine when you mess with the temp sensor then that's your issue (try a new temp sensor as its possible youve got a dud?)
oh and the 2e dosen't have a maf (air mass meter) its a proper air flow meter without an air intake sensor..
-
airboxes are all the same :wink: and if your engine runs fine when you mess with the temp sensor then that's your issue (try a new temp sensor as its possible youve got a dud?)
oh and the 2e dosen't have a maf (air mass meter) its a proper air flow meter without an air intake sensor..
Well 3 new sensors down and my luck cannot be that bad.
All wiring to the water sensor is fine and untouched.
The 2E still uses air intake temp sensor though or not? If not why is the wiring, or what I think to be the wiring there?
It's coming out the same section of the loom as the air intake temp, it, I think has the same connector and once I get my hands on a wiring diagram should also prove to be the correct coloured wires.
I've done everything I can with the water temp sensor and am pretty sure this isn't the problem. It's not wiggling it which fixes it, it's taking it off, which puts the car into set-up. So it would then not use the air intake sensor and use a default setting? as the car is set-up whilst stationary, so the reading would prove higher anyway potentially making the CO set-up slightly out, so a default "average" setting would assumably be used for this ...?
This is only what I'm thinking, but being proven otherwise I am quite happy with :smiley:.
-
I think a wire on the temp sensor is faulty (common fault on mk3's where the wiring becomes brittle with age and breaks down! it's usually the hall sensor that fails first but looking at the tape its possibly had a wiring issue before thats being disguised/bodged with blue tape?)
and the only way the ecu goes into learn mode is by disconnecting the battery for 15 minutes :wink: